accused of murder. His solicitor makes an explanation that he was not aware of the nature of his act because of his unsoundness of mind. In such case-

• A. The burden of proving (distortion of mind) will be on 'A'
• B. The burden of proving (in respect of unsoundness of mind) will be on the prosecution
• C. Prosecution has to prove that the accused is of sound mind
• D. Unsoundness of mind, unless it is refuted, must be presumed